7 Jun 2020

The walls of a barber shop are covered with a plane mirror and two movie films are made – one recording the movements of the barber and the other of his mirror image. From viewing the films later, can an observer differentiate between the object and the image?

The Observer can only Differentiate between two films if he knows the barber is left handed or right handed because in plain mirror the image size is same but laterally inverted. 

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Summation k=1 to 9 1/k(k+1)(k+2) Class 9/10 IOM

 ANSWER:  276